RAKUNA-IV is a radiation-type wave-dissipating block with 4 hollows on the surface. RAKUNA means "little hollow" in Latin. The hollows increase the surface roughness, which improves the wave-dissipating effect and also provides a habitat for marine organisms. The interlocking of the hollows and legs prevents the spread of damage and achieves high stability (Kd=10.8) against waves.
GRASP is a high stability wave-dissipating block that can be used in places where high stability is required, such as deepwater zones and high wave areas.
The tapered shaped legs that interlock with adjacent blocks enhance stability.
The porosity is very large as 63.5%, and the used number and costs can be greatly reduced. The stability number (Kd value=20.6) was calculated through joint research with Kyoto University and overseas research institutes, and the reliability of the stability is high.
STONE-BLOCK is a flat type block widely used as an armor block such as foot/bottom protections and revetments, seawalls and artificial reefs on coasts and breakwater mound armoring. To achieve a simple and low cost method, STONE-BLOCK was developed as an alternative to large armor stones.
SANREN is a highly stable wave-dissipating block against wave force. The strong interlocking of the legs prevents blocks from being scattered and lost.
A large void ratio of 60% realizes high performance at a low cost.
STONE-BLOCK REEF is covering block designed specifically for use on artificial reefs.
STONE-BLOCK REEF products include special blocks which protect the slope top that are the weakest point of an artificial reef.
